Birth Name: Benjamin Kubelsky
Date of Birth: February 14, 1894
Place of Birth: Chicago, Illinois, U.S.
Date of Death: December 26, 1974
Place of Death: Bel Air, Los Angeles, California, U.S.
Ethnicity: Ashkenazi Jewish
Jack Benny was an American comedian, vaudevillian, radio, television, and film actor, and violinist. His parents, Naomi or Emma (Sachs) and Meyer/Mayer Kubelsky, were Jewish immigrants from Poland/the Russian Empire. Jack was married to radio comedian and actress Mary Livingstone. Mary was also Jewish.
Jack’s paternal grandfather was named Benjamin Kubelsky (the son of Leib Kubeldziski and Fruma).
Jack’s paternal grandmother was named Zlotta Millerstein.
Source: Genealogy of Jack Benny (focusing on his father’s side) – https://www.geni.com